In 1979, following a second stint at Oklahoma, Harrison was hired as an assistant at New Mexico under head coach Norm Ellenberger. However, right before the team's season opener Ellenberger was suspended and later fired following the revelation of an academic fraud scandal nicknamed “Lobogate.” Harrison was tapped as the new head coach and led the depleted team to a 6–22 record. Following the season he was replaced by the more seasoned Gary Colson.[3]
After a two-year stint as an assistant at Iowa State under Johnny Orr, Harrison was named head coach at East Carolina (ECU). He led the Pirates for five seasons, compiling a record of 51–90. In January, 1987, Harrison announced he would step down from ECU at the close of the season.[4]